/*
 * Copyright (c) 2009 Johnny Mast
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/* Vectors (Called Vertex in OpenGL) are wonderful to calculate triangle's 
** and squares for openGL. These functions will take care of those calculations
** so we dont have to do it in our functions. Here are two great resources to learn 
** more about Vectors http://en.wikipedia.org/wiki/Euclidean_vector and this 
** is an other one more http://www.uofuiphone.com/Media/Vectors.mov 
*/

#import "GameEngine.h"


/*
** Functions here are defined static
** to hide visibilty from Games this engine is linked to
** this saves compile time.
*/
Vector2D Vector2DMake(XFFloat x, XFFloat y);

/*
** Math
*/
Vector2D Vector2DAdd(Vector2D v1, Vector2D v2);
Vector2D Vector2DSubstract(Vector2D v1, Vector2D v2);
Vector2D Vector2DInvert(Vector2D vector);
Vector2D Vector2DScale(Vector2D vector, XFFloat scale);

XFFloat Vector2DDotProduct(Vector2D v1, Vector2D v2);
XFFloat Vector2DCrossProduct(Vector2D v1, Vector2D v2);
XFFloat Vector2DMagnitude(Vector2D vector);
